There is another fallacy that I believe Netscape fell into at the time.

Rewrites often have the goal of "this time we are making everything perfect".

Which leads to tons of unnecessary abstractions and endless design proposals.

For Netscape 6 it was the idea of introducing XPCOM. "Classes are stupid everything is an interface".

Which later led to the "DeCOMtamination" project.

https://wiki.mozilla.org/Gecko:DeCOMtamination